US9091220B2 - Start clutch control device - Google Patents

Start clutch control device Download PDF

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Publication number
US9091220B2
US9091220B2 US13/516,200 US201013516200A US9091220B2 US 9091220 B2 US9091220 B2 US 9091220B2 US 201013516200 A US201013516200 A US 201013516200A US 9091220 B2 US9091220 B2 US 9091220B2
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United States
Prior art keywords
torque
transmission
value
start clutch
control device
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Expired - Fee Related
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US13/516,200
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US20120259522A1 (en
Inventor
Satoshi Kanazawa
Takeshi Kurata
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANAZAWA, SATOSHI, KURATA, TAKESHI
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
    • F02D41/022—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the clutch status
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/064—Control of electrically or electromagnetically actuated clutches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F16D48/08—Regulating clutch take-up on starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/306—Signal inputs from the engine
    • F16D2500/3064—Temperature of the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/308—Signal inputs from the transmission
    • F16D2500/30802—Transmission oil properties
    • F16D2500/30803—Oil temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/308—Signal inputs from the transmission
    • F16D2500/30806—Engaged transmission ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/314—Signal inputs from the user
    • F16D2500/31406—Signal inputs from the user input from pedals
    • F16D2500/3144—Accelerator pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/50—Problem to be solved by the control system
    • F16D2500/502—Relating the clutch
    • F16D2500/50224—Drive-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
    • F16D2500/70422—Clutch parameters
    • F16D2500/70438—From the output shaft
    • F16D2500/7044—Output shaft torque

Definitions

  • the present invention relates to a start clutch control device for controlling an output torque by a driving source of a vehicle at the startup of the vehicle.
  • Patent document 1 Japanese Patent Laid-open No. 2009-24646
  • the input torque of the transmission may not be appropriately controlled.
  • the load on the start clutch is smaller than the input torque of the transmission, the load relative to the output torque of the engine is smaller; thereby, the revolution number of the engine increases.
  • Such fluctuation on the revolution number of the engine may be a reason for hindering a smooth startup of the vehicle.
  • the present invention provides a start clutch control device which is configured to control a connection between a driving side and a driven side of a vehicle through a start clutch disposed between the two sides and comprises: a first torque determining unit configured to determine a value of a torque input from a driving source of the vehicle to a transmission of the vehicle on the basis of a load acting on the start clutch; a second torque determining unit configured to determine a value of a torque input to the transmission of the vehicle from the driving source of the vehicle on the basis of a manipulated amount of an accelerator pedal of the vehicle; and a torque limiting unit configured to limit the torque to the value determined by the first torque determining unit as long as the value determined by the first torque determining unit is less than the value determined by the second torque determining unit after the accelerator pedal is manipulated while the start clutch is in a released state.
  • the torque limiting unit limits the torque input to the transmission to the value determined by the first torque determining unit on the basis of the load acting on the start clutch as long as the value determined by the first torque determining unit is less than the value determined by the second torque determining unit on the basis of the manipulated amount of the accelerator pedal of the vehicle.
  • the revolution number of the engine is restrained so that the input torque of the transmission at the startup of the vehicle is smaller than the torque output from the driving source according to the manipulated amount of the accelerator pedal so as to enable a smooth startup.
  • the first torque determining unit is provided with a cooling water temperature detecting unit configured to detect a temperature of cooling water used to inhibit a temperature of the driving source from increasing and a torque correcting unit (e.g., a second torque correcting unit) configured to correct the value of the torque input to the transmission according to the temperature, and the second torque correcting unit corrects the torque input to the transmission according to a correction factor possessing such a characteristic that the value thereof decreases or remains at the same value as the temperature increases.
  • a cooling water temperature detecting unit configured to detect a temperature of cooling water used to inhibit a temperature of the driving source from increasing
  • a torque correcting unit e.g., a second torque correcting unit
  • the first torque determining unit is provided with a transmission ratio calculating unit configured to calculate a transmission ratio of the transmission and a torque correcting unit (e.g., a third torque correcting unit) configured to correct the value of the torque input to the transmission according to the transmission ratio.
  • a torque correcting unit e.g., a third torque correcting unit
  • the torque output from the transmission fluctuates; however, by correcting the torque input to the transmission according to the transmission ratio through the third torque correcting unit, the output torque of the transmission can be corrected appropriately.
  • the transmission ratio calculating unit calculates the transmission ratio denoted by a rate between an output torque of a driven side and an input torque of a driving side of the transmission, and the third torque correcting unit corrects the torque input to the transmission according to a correction factor possessing such a characteristic that the value thereof decreases or remains at the same value as the transmission ratio increases.
  • the transmission ratio (a rate obtained by dividing the output torque by the input torque) calculated on the basis of the output torque
  • the torque output from the transmission becomes greater as well; by correcting the torque input to the transmission to be smaller through the second torque correcting unit, the increment of the output torque of the transmission is inhibited.
  • the transmission ratio calculated on the basis of the output torque is smaller, the torque output from the transmission becomes smaller as well; by correcting the torque input to the transmission greater through the second torque correcting unit, the decrement of the output torque of the transmission is compensated.
  • the transmission ratio calculating unit calculates the transmission ratio denoted by a rate between a revolution number of a driving side and a revolution number of a driven side of the transmission, and the third torque correcting unit corrects the torque input to the transmission according to a correction factor possessing such a characteristic that the value thereof decreases or remains at the same value as the transmission ratio increases.
  • the transmission ratio (a rate obtained by dividing the input revolution number by the output revolution number) calculated on the basis of the revolution number
  • the torque output from the transmission becomes greater as well; by correcting the torque input to the transmission to be smaller through the second torque correcting unit, the increment of the output torque of the transmission is inhibited.
  • the transmission ratio calculated on the basis of the revolution number is smaller, the torque output from the transmission becomes smaller as well; by correcting the torque input to the transmission to be greater through the second torque correcting unit, the decrement of the output torque of the transmission is compensated.
  • the first torque determining unit is provided with a torque correcting unit (e.g., a first torque correcting unit) configured to correct the value of the torque input to the transmission according to a variation amount of the load acting on the start clutch; the first torque correcting unit corrects the torque input to the transmission according to a correction value possessing such a characteristic that the value thereof increases or remains at the same value as the load variation amount increases.
  • a torque correcting unit e.g., a first torque correcting unit
  • FIG. 1 is a diagram illustrating a schematic configuration of a start clutch control device according to an embodiment of the present invention
  • FIG. 2 is a flow chart illustrating a procedure of a control process of the start clutch performed by a CPU of a start clutch control device in. FIG. 1 ;
  • FIG. 3( a ) is an example graph illustrating a characteristic between an actual pressure Pa of the start clutch and a load upper limit value a0 of the start clutch according to an embodiment of the present invention
  • FIG. 3( b ) is an example graph illustrating a characteristic between a desired pressure value PCCMD of the start clutch and the load upper limit value a0 of the start clutch according to an embodiment of the present invention
  • FIG. 3( c ) is an example graph illustrating a characteristic between an engine cooling water temperature TW and a torque correction factor a1 according to an embodiment of the present invention
  • FIG. 3( d ) is an example graph illustrating a characteristic between a transmission ratio TR of a transmission and a torque correction factor a2 according to an embodiment of the present invention
  • FIG. 3( e ) is an example graph illustrating a characteristic between a variation amount of a pressure of the start clutch and a variation amount of the load upper limit value of the start clutch ⁇ TQ according to an embodiment of the present invention.
  • FIG. 4 is an example graph illustrating parameter variations of (a) an acceleration G of the vehicle, (b) an engine revolution number NE, (c) an actual engine output torque TQEG, (d) a desired pressure value PCCMD of the start clutch, and (e) an accelerator opening degree AP with time.
  • FIG. 5 is an embodiment of a start clutch control device according to the present invention.
  • FIG. 1 is a diagram illustrating a configuration of a start clutch control device according to an embodiment of the present invention.
  • the present embodiment relates to a clutch control device of a vehicle using an engine (internal combustion engine) as a driving source, and a transmission used in the vehicle is a continuous variable transmission (CVT).
  • an engine internal combustion engine
  • CVT continuous variable transmission
  • a driving shaft 2 for transmitting an output from the engine 1 of the vehicle is joined to an input shaft 5 of the transmission through a forward-backward movement switching mechanism 3 and a forward clutch 4 .
  • the input shaft 5 is disposed with a variable pulley (hereinafter, referred to as “driving side pulley”) configured to have the width of a V groove, namely the wrapping diameter of a driving belt 7 be adjusted via a variable oil pressure cylinder 6 .
  • the driving belt 7 is wrapped on the driving side pulley 8 of the transmission and a variable pulley (hereinafter, referred to as “driven side pulley”) 11 disposed on a driven shaft 9 of the transmission.
  • the driven side pulley 11 is also configured to have the width of the V groove, namely the wrapping diameter of the driving belt 7 be adjusted via a variable oil pressure cylinder 10 .
  • the continuous variable transmission is constructed by the constituent elements of 3 to 11 mentioned above.
  • the driven shaft 9 is joined to an output shaft 14 disposed with an output gear 13 via a start clutch 12 having a clutch piston which is not shown in the drawings, and the output gear 13 is joined to a differential device 17 via intermediate gears 15 and 16 .
  • the torque transmitted from the engine 1 to the driving shaft 2 is transmitted to the driving side pulley 8 via the forward clutch 4 , and is then transmitted to the driven side pulley 11 via the driving belt 7 .
  • the torque of the driven side pulley 11 is transmitted to the output shaft 14 via the start clutch 12 , and the torque of the output shaft 14 is transmitted to right and left driving wheels (not shown) via the output gear 13 , the intermediate gears 15 and 16 , and the differential device 17 .
  • the revolution and the output torque of the engine 1 are controlled by an electronic control unit (ECU) 20 .
  • the ECU 20 is connected by a transmission control device 31 configured to control oil pressures of the oil pressure cylinders 6 and 10 and the like.
  • the transmission control device 31 is composed of a CPU 31 a for executing various arithmetic computation processes, a storage device (memory) 31 b composed of a ROM and a RAM for storing various arithmetic computation programs executed in the CPU 31 a , various tables to be described later, arithmetic computation results and the like, and an input-output interface 31 c configured to receive various electric input signals and output driving signals (electric signals) on the basis of the arithmetic computation results and the like to the external side.
  • a CPU 31 a for executing various arithmetic computation processes
  • a storage device (memory) 31 b composed of a ROM and a RAM for storing various arithmetic computation programs executed in the CPU 31 a , various tables to be described later, arithmetic computation results and the like
  • an input-output interface 31 c configured to receive various electric input signals and output driving signals (electric signals) on the basis of the arithmetic computation results and the like to the
  • the transmission control device 31 is configured as the start clutch control device which also performs the start clutch control.
  • the start clutch control process (a process by a first torque determining unit 31 a 1 , a process by a second torque determining unit 31 a 2 and a process by a torque limiting unit 31 a 3 ) to be described hereinafter is executed by the CPU 31 a of the transmission control device 31 .
  • the first torque determining unit 31 a 1 (also referred to herein as the first torque determining device) is provided with a cooling water temperature detecting unit (shown in FIG. 5 ) configured to detect a temperature of cooling water used to inhibit a temperature of the driving source from increasing.
  • the transmission control device 31 is fed with values output by the ECU 20 such as an engine revolution number NE, a accelerator opening degree AP varying in response to the manipulation of the accelerator pedal (not shown), and an engine water temperature TW.
  • the transmission control device 31 is also fed with an output from an input shaft rotation sensor 21 installed nearby the driving side pulley 8 for detecting a revolution number Ndr of the input shaft 5 , an output from a driven shaft rotation sensor 22 installed nearby the driven side pulley 11 for detecting a revolution number Ndn of the driven shaft 9 , and an output from an output shaft rotation sensor 23 installed nearby the output shaft 14 for detecting a vehicular velocity VEL.
  • the transmission control device 31 is configured to provide current signals for actuating a linear solenoid valve of the start clutch oil pressure control device 34 and to detect a voltage value LSV applied to the solenoid.
  • the transmission control device 31 is connected by a transmission selector (a transmission ratio selecting device) 40 of automatic transmission.
  • the state of a select lever (not shown) of the selector 40 is detected and fed into the transmission control device 31 .
  • the selector 40 is configured to be selectable among 6 ranges: neutral (N), parking (P), drive (D), reverse (R), second (S) and low (L)
  • the transmission control device 31 is configured to output signals for generating a driving side pulley oil pressure (DR) and a driven side pulley oil pressure (DN) and signals for actuating the linear solenoid valve of the start clutch oil pressure control device 34 to control oil pressure generating devices 33 a and 33 b , and signals for controlling the output torque of the engine 1 to the ECU 20 , respectively.
  • DR driving side pulley oil pressure
  • DN driven side pulley oil pressure
  • An oil inlet side of a pressure head (PH) generating device 32 is connected to an oil tank 36 via an oil pump 35 .
  • An oil outlet side of the PH generating device 32 is connected to oil inlet sides of the control oil pressure generating device 33 a and 33 b to feed the oil pressures from the PH generating device 32 to the control oil pressure generating devices 33 a and 33 b.
  • An oil outlet side of the control oil pressure generating device 33 a is connected to the oil pressure cylinder 6
  • an oil outlet side of the control oil pressure generating 33 b is connected to an oil inlet side of the oil pressure cylinder 10 ; thereby, the oil pressures are adjusted according to the control signals from the transmission control device 31 and are supplied to the oil pressure cylinders 6 and 10 , respectively.
  • the transmission ratio of the continuous variable transmission is determined through the determination of the widths of V grooves of the driving side pulley 8 and the driven side pulley 11 on the basis of the oil pressures supplied from the control oil pressure generating devices 33 a and 33 b to the oil pressure cylinders 6 and 10 , respectively. As shown in FIG.
  • the first torque determining device 31 a 1 is provided with a cooling water temperature detecting unit configured to detect a temperature of cooling water used to inhibit a temperature of the driving source from increasing and a torque correcting unit (e.g., a second torque correcting unit) configured to correct the value of the torque input to the transmission according to the temperature, and the second torque correcting unit corrects the torque input to the transmission according to a correction factor possessing such a characteristic that the value thereof decreases or remains at the same value as the temperature increases.
  • a cooling water temperature detecting unit configured to detect a temperature of cooling water used to inhibit a temperature of the driving source from increasing
  • a torque correcting unit e.g., a second torque correcting unit
  • the second torque correcting unit corrects the torque input to the transmission according to a correction factor possessing such a characteristic that the value thereof decreases or remains at the same value as the temperature increases.
  • the first torque determining unit 31 a 1 is provided with a transmission ratio calculating unit configured to calculate a transmission ratio of the transmission and a torque correcting unit (e.g., a third torque correcting unit) configured to correct the value of the torque input to the transmission according to the transmission ratio.
  • a torque correcting unit e.g., a third torque correcting unit
  • the first torque determining unit 31 a 1 is provided with a torque correcting unit (e.g., a first torque correcting unit) configured to correct the value of the torque input to the transmission according to a variation amount of the load acting on the start clutch; the first torque correcting unit corrects the torque input to the transmission according to a correction value possessing such a characteristic that the value thereof increases or remains at the same value as the load variation amount increases.
  • a torque correcting unit e.g., a first torque correcting unit
  • the description will be carried out on the start clutch control process executed by the CPU 31 a of the transmission control device 31 serving as the start clutch control device.
  • the CPU 31 a functions as the first torque determining unit 31 a 1 , the second torque determining unit 31 a 2 , and the torque limiting unit 31 a 3 in the present invention.
  • FIG. 2 is a flow chart illustrating a procedure of the start clutch control process executed by the CPU 31 a .
  • the control process program illustrated by the flow chart is called up and executed at predetermined time intervals (for example, every 10 msec).
  • the transmission control device 31 judges whether the control mode is on or off. If it is in an off state, the procedure advances to step ST 2 .
  • the transmission control device 31 judges whether or not a control condition is satisfied. Specifically, whether an oil temperature OT is not greater than a predetermined value V1, whether the desired pressure value PCCDMD of the start clutch is not greater than a predetermined value V2, whether a slip factor ESC of the start clutch is not smaller than a predetermined value V3, whether the vehicular velocity VEL is not greater than a predetermined value V4, and whether the accelerator pedal is being manipulated are judged, and when all the judgment results are affirmative (YES), the control condition is judged to be satisfied.
  • the desired pressure value PCCDMD of the start clutch is referred to as a desired value of a pressure acting on the start clutch.
  • the predetermined value V1 is set at a value by which it is possible to determine that the output torque of the engine should be limited.
  • the oil temperature OT is estimated as follows. As mentioned above, a resistance value of the solenoid is obtained from the current value supplied from the CPU 31 a to the solenoid of the start clutch oil pressure control device 34 and the voltage value LSV applied to the solenoid; on the basis of a table denoting a relationship between resistance values of the solenoid and temperatures, the temperature of the solenoid is determined, and the determined temperature of the solenoid is estimated as the oil temperature OT.
  • the clutch piston of the start clutch is built with a spring. As the start clutch is engaged, the spring is pressed. Therefore, when the desired pressure value PCCMD of the start clutch is smaller than a pressure pressing the spring to initiate the engagement (hereinafter, referred to as “reactive stroke pressure”), the start clutch is in a released state.
  • the predetermined value V2 is set at a value by which it is possible to determine whether or not the start clutch is in the released state.
  • the predetermined value V3 is set at a value so that it is possible to determine whether or not the start clutch is in the released state according to the slip factor (ease to slip) of the start clutch.
  • the vehicle advances according to a creep phenomenon. Since the present control is performed at the startup, the predetermined value V4 is set at a value by which it is possible to judge whether the vehicular velocity of the vehicle is not greater than a velocity of the vehicle advanced according to the creep phenomenon so as to differentiate from the normal running.
  • the judgment at step ST 2 is performed by using the above four predetermined values of V1 to V4. When the start clutch is in the released state and the accelerator pedal is manipulated, all the conditions are satisfied.
  • step ST 2 If it is determined to be NO at step ST 2 , the procedure advances to step ST 3 where the transmission control device 31 turns off the control mode (e.g., changes the state to control mode off) and terminates the control process.
  • the transmission control device 31 turns off the control mode (e.g., changes the state to control mode off) and terminates the control process.
  • step ST 4 the transmission control device 31 determines an load upper limit value a0 of the start clutch.
  • the load upper limit value a0 of the start clutch is determined by searching a preliminarily prepared table possessing a characteristic as illustrated in FIG. 3( a ).
  • the horizontal axis denotes the pressure Pa (unit: kgf/cm 2 ) of the start clutch and the vertical axis denotes the load upper limit value a0 of the start clutch (unit: Nm).
  • the pressure Pa of the start clutch is obtained by subtracting the reactive stroke pressure from the desired pressure value PCCMD of the start clutch.
  • the pressure Pa of the start clutch is referred to as a pressure for pushing the driving side and the driven side of the start clutch against each other.
  • the reactive stroke pressure is determined through learning; therefore, the value thereof may fluctuate.
  • FIG. 3( b ) illustrates a characteristic curve in which the horizontal axis of FIG. 3( a ) is changed to the desired pressure value of the start clutch PCCMD (The vertical axis remains at the same as FIG. 3( a )),
  • the P 1 in FIG. 3( b ) denotes the reactive stroke pressure of the start clutch. In other words, the pressure from 0 to P 1 denotes the released state of the start clutch.
  • the characteristic curve of the load upper limit value a0 of the start clutch is determined according to the performance of the start clutch. If a load input to the start clutch is greater than the load upper limit value a0 associated with the engaged state of the start clutch, the revolution number of the engine increases. When the pressure is from 0 to P 1 , since the start clutch is in the released state, the upper limit value a0 is equal to zero; when the pressure is greater than P 1 , the load upper limit value a0 of the start clutch increases as the pressure of the start clutch increases.
  • a table is expected to be prepared preliminarily; therefore, the present embodiment uses the table in FIG. 3( a ) possessing a characteristic without being affected by the reactive stroke P 1 which fluctuates through learning.
  • step ST 5 the transmission control device 31 determines a correction factor a1 for correcting the response delay on the output torque from the engine.
  • the correction factor a1 is determined by searching a preliminarily prepared table possessing a characteristic illustrated by an example in FIG. 3( c ).
  • the horizontal axis denotes the cooling water temperature TW of the engine (for example, from ⁇ 25° C. to 120° C.), and the vertical axis denote the correction factor a1 of the output torque of the engine (a dimensionless number ranging from 0 to 5, for example).
  • the numeral “a” in FIG. 3( c ) denotes a predetermined low temperature and the “b” in FIG. 3( c ) denotes a predetermined high temperature.
  • the correction factor a1 is configured to be greater as the water temperature TW is low and be smaller as the water temperature TW is high.
  • the water temperature is set within a normal temperature range.
  • step ST 6 the transmission control device 31 determines a correction factor a2 for the transmission ratio TR of the transmission.
  • the correction factor a2 is determined by searching a preliminarily prepared table possessing a characteristic illustrated in FIG. 3( d ).
  • the horizontal axis denotes the transmission ratio TR of the transmission (a dimensionless number ranging from 0.43 to 2.52, for example), and the vertical axis denotes the correction factor a2 for the output torque of the engine (a dimensionless number ranging from 0 to 6, for example).
  • the numeral “a” in FIG. 3( d ) denotes a predetermined transmission ratio and the numeral “b” in FIG. 3( d ) denotes a predetermined transmission ratio.
  • the correction factor a2 is configured to be greater; as the transmission ratio is high, since the output torque is great, the correction factor a2 is configured to be smaller. Thereby, engine failure is prevented from occurring due to insufficient output torque.
  • a transmission ratio calculating unit is configured to calculate the transmission ratio TR as a rate between the revolution number of the driving side and the revolution number of the driven side (a rate obtained by dividing the input revolution number by the output revolution number). It is also acceptable to calculate the transmission ratio TR as a rate between the output torque and the input torque (a rate obtained by dividing the output torque by the input torque).
  • step ST 7 the transmission control device 31 calculates an initial value of a previous limit value TQ0 of the output torque of the engine according to the following expression.
  • TQ 0 a 0 ⁇ a 1 ⁇ a 2
  • An appropriate initial value of the output torque of the driving source can be obtained by correcting the output torque of the driving source by the use of the correction factor a1 related to the cooling water temperature TW of the engine and the correction factor a2 related to the transmission ratio TR of the transmission when the accelerator pedal is manipulated with respect to the load upper limit value a0 of the start clutch related to the pressure Pa of the start clutch when the accelerator pedal is manipulated.
  • step ST 8 the transmission control device 31 turns on the control mode (e.g., changes the state to control mode on) and terminates the control process.
  • the control mode e.g., changes the state to control mode on
  • the initial value of the previous limit value TQ0 of the output torque of the engine is determined according to the procedure from step ST 4 to step ST 8 .
  • FIG. 4 is an example illustrating a temporal variation (hereinafter, referred to as “pattern”) of each value of the acceleration G, the revolution number NE of the engine, the output torque TQEG of the engine, the desired pressure value PCCMD of the start clutch, and the accelerator opening degree AP.
  • the vertical axis denotes the value of each parameter, and the horizontal axis denotes the time.
  • the solid line denotes the pattern by the current control
  • the dashed line denotes the pattern by the conventional control.
  • the current control has two patterns illustrated by the solid lines p and q.
  • the pattern p denotes a pattern of a desired output torque of the engine
  • the pattern q denotes a pattern of an actual output torque related to the response delay of the output torque of the engine.
  • the time T0 denotes a timing where the accelerator pedal is manipulated, and the value of each parameter varies after the time T0.
  • the time T1 denotes a timing where the control process is terminated.
  • the initial value of the previous limit value TQ0 calculated at step ST 7 denotes the value of the output torque TQEG of the engine in the pattern p at time T0 in FIG. 4 .
  • step ST 9 when the control mode is on at step ST 1 (e.g., when the control mode is in an “on” state), the procedure advances to step ST 9 where the transmission control device 31 obtains the variation amount ⁇ TQ of the load upper limit value of the start clutch in the current control cycle.
  • the variation amount ⁇ TQ is determined by searching a preliminarily prepared table possessing a characteristic illustrated in FIG. 3( e ).
  • the horizontal axis denotes the variation amount of the pressure of the clutch per control cycle (unit: kgf/cm 2 per control cycle), and the vertical axis denotes the variation amount ⁇ TQ of the load upper limit value of the clutch per control cycle (unit: Nm/control cycle).
  • the numeral “a” in FIG. 3( e ) denotes a predetermined variation amount and the numeral “b” in FIG. 3( e ) denotes a predetermined variation amount. Since the characteristic of the start clutch varies according to the oil temperature OT, plural characteristic curves are prepared according to the oil temperature OT; therefore, there are 3 kinds of graphs i, j and k illustrated in the drawing.
  • the variation amount ⁇ TQ of the load upper limit value of the start clutch possesses such a characteristic that the variation amount ⁇ TQ of the load upper limit value of the start clutch becomes smaller as the variation amount of the pressure of the start clutch is small and becomes greater as the variation amount of the pressure of the start clutch is great.
  • the pressure pressing the driving side and the driven side of the start clutch against each other increases, the upper limit of the load on the start clutch increases; thereby, the variation amount ⁇ TQ of the load upper limit value becomes greater.
  • the clutch load variation ⁇ TQ a fixed value (lower limit)
  • the clutch load variation ⁇ TQ a fixed value (upper limit).
  • the clutch is set to work in a normal working range.
  • step ST 10 the transmission control device 31 determines the correction factor a2 of the transmission ratio TR of the transmission, similar to the step ST 6 .
  • step ST 11 the transmission control device 31 calculates a current limit value TQ1 of the output torque of the engine according to the following expression.
  • TQ 1 TQ 0+ ⁇ TQ ⁇ a 2
  • the current limit value TQI denotes the period from time T0 to T1 in the pattern p of the output torque TQEG of the engine in FIG. 4 .
  • the variation amount of the desired pressure value PCCMD of the start clutch corresponds to the slope of each control cycle of the desired pressure value PCCMD of the start clutch from time T0 to T1 in FIG. 4 . According to the slope, the slope of the pattern p of the output torque TQEG of the engine from time T0 to T1 is determined at the step ST 11 .
  • step ST 9 The procedure from step ST 9 to step ST 11 is equivalent to the process by the first torque determining unit 31 a 1 in the present invention.
  • step ST 12 the transmission control device 31 determines whether or not the current limit value TQ1 is less than an output torque TQAP of the engine determined based on the manipulated amount of the accelerator pedal.
  • the value of the output torque TQAP is determined by the second torque determining unit 31 a 2 .
  • step ST 12 If the determination result of step ST 12 is YES, the procedure advances to step ST 13 where the transmission control device 31 sets the previous limit value TQ0 as the current limit value TQ1, and output a signal to ECU 20 to limit the output torque of the engine. Subsequently, the procedure advances to step ST 14 where the transmission control device 31 turns on the control mode (e.g., changes the state to control mode on) and terminates the control process.
  • the transmission control device 31 turns on the control mode (e.g., changes the state to control mode on) and terminates the control process.
  • step ST 12 If the determination result of step ST 12 is NO, the procedure advances to step ST 15 where the transmission control device 31 turns off the control mode (e.g., changes the state to control mode off) and terminates the control process.
  • the transmission control device 31 turns off the control mode (e.g., changes the state to control mode off) and terminates the control process.
  • step ST 12 and ST 13 is equivalent to the process by the torque limiting unit 31 a 3 .
  • the transmission control device 31 determines the initial value TQ0 of the output torque of the engine at step ST 4 to step ST 8 , determines the current limit value TQ1 of the output torque of the engine according to the variation amount of the pressure of the start clutch at step ST 9 to step ST 11 , and as long as the current limit value TQ1 is less than the output torque TQAP of the engine determined according to the manipulated amount of the accelerator pedal, determines the limit torque of the output torque of the engine at step ST 9 to step ST 11 .
  • step ST 9 to step ST 11 are equivalent to time T0 to time T1; and at time T1, the determination result of step ST 12 is NO, the control process is terminated.
  • the initial value of the output torque of the engine is determined according to the desired pressure value PCCMD of the engine, the water temperature TW of the engine and the transmission ratio TR. of the transmission. Thereafter, as long as the current limit value TQ1 of the output torque of the engine determined according to the variation amount of the pressure of the clutch and the oil temperature OT is less than the output torque TQAP of the engine determined according to the manipulated amount of the accelerator pedal, the output torque of the engine is limited to the current limit value TQ1.
  • the start clutch control device of the present invention described in the above can be practically and effectively used in a vehicle disposed with a start clutch.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fluid Mechanics (AREA)
  • Electromagnetism (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
US13/516,200 2010-02-23 2010-12-07 Start clutch control device Expired - Fee Related US9091220B2 (en)

Applications Claiming Priority (3)

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JP2010037964 2010-02-23
JP2010-037964 2010-02-23
PCT/JP2010/071893 WO2011104974A1 (ja) 2010-02-23 2010-12-07 発進クラッチ制御装置

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US20120259522A1 US20120259522A1 (en) 2012-10-11
US9091220B2 true US9091220B2 (en) 2015-07-28

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EP (1) EP2520787B1 (ja)
JP (1) JP5551762B2 (ja)
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US9393947B2 (en) 2013-03-07 2016-07-19 Ford Global Technologies, Llc Torsional damping using a torque convertor bypass clutch
EP2989342B1 (en) * 2013-04-22 2021-06-02 Dana Belgium N.V. System and method for the update of fill parameters in wet clutches through cross learning
JP2014214678A (ja) * 2013-04-25 2014-11-17 アイシン精機株式会社 車両用駆動装置
JP2016142138A (ja) * 2015-01-29 2016-08-08 株式会社デンソー 内燃機関の制御装置
CN112061109A (zh) * 2020-09-03 2020-12-11 广西柳工机械股份有限公司 动力传动控制方法、装置、车辆和存储介质

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Also Published As

Publication number Publication date
EP2520787A1 (en) 2012-11-07
US20120259522A1 (en) 2012-10-11
JP5551762B2 (ja) 2014-07-16
JPWO2011104974A1 (ja) 2013-06-17
EP2520787B1 (en) 2014-10-08
CN102741527B (zh) 2016-04-06
CN102741527A (zh) 2012-10-17
WO2011104974A1 (ja) 2011-09-01
EP2520787A4 (en) 2013-08-14

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